Genes are composed of stretches of a complex molecule shaped like a twisted ladder or staircase.

Genes are composed of stretches of DNA, a complex molecule shaped like a twisted ladder or staircase.

The shape of DNA is a double helix, which is like a twisted ladder. The sides of the ladder are made of alternating sugar and phosphate molecules. The sugar is deoxyribose. The rungs of the ladder are pairs of 4 types of nitrogen bases. A is always paired with T and G is always paired with C.

he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

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